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Journal Articles Physics Letters B Year : 2014

Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at sqrt(s) = 8 TeV

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V. Khachatryan
  • Function : Author
S. Baffioni
P. Busson
R. Granier de Cassagnac
C. Mironov
P. Paganini
C. Collard
P. van Hove
D. Contardo
M. Gouzevitch
M. Lethuillier
V. Sordini

Abstract

A search for supersymmetry through the direct pair production of top squarks, with Higgs (H) or Z bosons in the decay chain, is performed using a data sample of proton-proton collisions at sqrt(s) = 8 TeV collected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5 inverse femtobarns. The search is performed using a selection of events containing leptons and bottom-quark jets. No evidence for a significant excess of events over the standard model background prediction is observed. The results are interpreted in the context of simplified supersymmetric models with pair production of a heavier top-squark mass eigenstate stop[2] decaying to a lighter top-squark mass eigenstate stop[1] via either stop[2] to H stop[1] or stop[2] to Z stop[1], followed in both cases by stop[1] to t neutralino, where neutralino is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the stop[1] and neutralino states is approximately equal to the top-quark mass (m[stop[1]] - m[neutralino] ~= m[t]), which is not probed by searches for direct stop[1] squark pair production. The analysis excludes top squarks with masses m[stop[2]]<575 GeV and m[stop[1]]<400 GeV at a 95% confidence level.

Dates and versions

in2p3-00991791 , version 1 (16-05-2014)

Identifiers

Cite

V. Khachatryan, S. Baffioni, F. Beaudette, P. Busson, C. Charlot, et al.. Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at sqrt(s) = 8 TeV. Physics Letters B, 2014, 736, pp.371-397. ⟨10.1016/j.physletb.2014.07.053⟩. ⟨in2p3-00991791⟩
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